Repeating action for square and grand pianos



(No Model.)

F. POLSTER. REPEATING ACTION FOR SQUARE AND GRAND PIANOS.

No. 326,586. Patented Sept. 22, 1885.

UNITED STATES PATENT OFFICEQ FERDINAND POLSTER, OF BALTIMORE, MARYLAND,ASSIGNOE TO \VM. KNABE & 00., OF SAME PLACE.

REPEATlNG-ACTION FOR SQUARE AND GRAND PlANOS.

SPECIFICATION forming part of Letters Patent No. 326,586, dated Septem e1385- Application filed April 24, 1885.

T0 aZl whom it may concern:

Be it known that I, FERDINAND Porsrnn, of Baltimore, in the county ofBaltimore and State of Maryland, have invented certain new and usefulIniprovementsin Repeating-Actions for Grand and Square Pianos; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

My invention relates to an improvement in repeating-actions for grandand square pianos, the object of the same being to simplify the presentconstruction of repeating-actions without increasing the cost ofmanufacture or increasing the friction between the several parts; andwith these ends in view my invention con sists in the parts andcombination of parts, as will be more fully described, and pointed outin the claims.

The accompanying drawing represents my improvement in side elevation,some of the parts being shown in section.

A represents the key, mounted in the usual manner, and B the main jack,pivoted at its elbow to the block 0, which latter is pivoted to the studa at right angles to the pin l),which secures the jack to the block 0.This construction of parts allows the jack,in addition to the usual backand forward motion necessary to escapement, a lateral motion, whichprevents the possibility of the main jack jamming or sticking in thenotched under lever, D, in which it moves. This under lever, D, ispivotally secured at its rear end to the arm D,

- secured to the ham mer-rest D and is provided near its front end withan elongated slot, 0, in which the free end of the longer arm of themain jack B rests. The front or free end of the under lever, D, isnotched to receive the upper end of the auxiliary jack E, to the lowerend of which is rigidly secured the screw or pin F, which latter movesloosely in the shorter arm or square of the main jack B. The pin F ispreferably provided with screwthreads to enable the button G, havingacushioned lower face, d, to be adjusted toward and away from the squareof the main j ack,and regulate the movement of the upper end of the longarm of the main jack, and also the (No model.)

movement of the under lever and hammer. The auxiliary jack is alsoprovided with the adjusting -screw 6, carrying the cushion 6, againstwhich the long arm of the main jack strikes when the key is struck.

J is a screw secured to the outer end of the square of the main jack,and provided at its lower end with a cup shaped button, J, adapted toreceive the upper end of a coiled spring, the lower end of which restsagainst the block J secured to the key. This button can be adjusted onthe screw for regulating the tension of the spring, or the screw can beturned and perform precisely the same function.

K is the hammer-butt, pivoted in the usual manner, and provided on itslower face with an escapement-ball, K, which latter rests on the underlever, immediately over the slot 0 and over the upper end of the longarm of the main jack. Vhen the parts are adjusted by the button G andscrew e to permit the upper end of the long arm of the main jack to havefree movement in the slot 0, the upper end of the main jack rises abovethe under lever, strikes the escapementball, and immediately moves tothe front of said escapement-ball.

The upward movement of the under lever and jacks is regulated by thescrew L, secured in the block G, to which the hammer-butt is pivotedimmediately over the front end of the under lever. This screw can beadjusted longitudinall y for increasing or decreasing the upward throwof the under lever.

M is the back-check, secured to the key and operating in the usualmanner.

The hammer is held in an elevated position for a repeat of the tone bythe under lever, D, which is held in position by the auxiliary jack.

It is evident that numerous slight changes may be made in the form andrelative arrangement of parts without departing from the spirit of myinvention; hence I would have it understood that I do not limit myselfto the 9 exact construction herein shown and described,

but consider myself at liberty to make such changes and alterations asfairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-- 1. The combination,with an underlever anda main jack, of an auxiliary jack pivotally connected to the underlever, and provided with an adjustable bearing, which latter rests onthe main jack.

2. The combination,with an under lever and a mainjack, of an auxiliaryjack pivoted to the under lever, a threaded pin secured to the auxiliaryjack and resting Within a slot in the square of the main jack, and abutton adj ustably secured on the threaded pin.

3. The combination, with an under lever having a slot therein, and ahammer resting immediately over said lever, of the main jack pivoted tothe key, and an auxiliary jack connected with the under lever andprovided with a pin passing 1oosely through the main jack.

4. The combination, with a key, hammer, and under levcr,of the mainjack, an auxiliary jack,and an adjustable stop secured to the auxiliaryjack and forming a bearing for the main jack.

5. In a piano-action, the combination, with a key having a block, J,thereon, and a main jack pivoted to said block, of a spring resting onthe bl0ck,and a button adjustably secured to the main jack and forming abearing for the upper end of the spring.

6. In a piano-action, the combination, with a key, ofa block, 0, )ivotedto the key, and a main jack pivoted to the block, substantially asdescribed.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

FERDINAND POLSTER.

Witnesses:

E. A. HEINZ, GEO. KOPPELMAN.

